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United States Patent | 5,283,663 |
Kawasaki ,   et al. | February 1, 1994 |
A method is disclosed for performing data communication between a pair of circuits. The data communication is established by serially transmitting information which includes pulse signals. In executing the method, a reference time is determined as an instant of a first level change in a first direction of a pulse signal output from one of the circuits to the other. A judgement is made as to whether a first bit of data is a "1" or a "0" in accordance with a time period extending from the reference time to an instant of a subsequent level change in the first direction following the reference time. The instant of the subsequent level change in the first direction is determined as a reference time relative to the next bit of data in the pulse signal. The data of a predetermined number of bits is continuously transmitted by repeatedly establishing reference times and judging the value of a bit based on the time period which extends from the reference time to a subsequent level change.
Inventors: | Kawasaki; Masahiro (Tokyo, JP); Naruo; Teruhiko (Kyoto, JP); Ohsawa; Yutaka (Tokyo, JP); Hashimoto; Isamu (Tokyo, JP) |
Assignee: | Asahi Kogaku Kogyo Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 568516 |
Filed: | August 16, 1990 |
Aug 17, 1989[JP] | 1-212008 | |
Sep 18, 1989[JP] | 1-241459 |
Current U.S. Class: | 358/426.12; 358/468 |
Intern'l Class: | H04N 001/41 |
Field of Search: | 358/426,427,261.1,261.2,261.3,262.1,431,432,468 359/154 |
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